Views: 9 Author: Site Editor Publish Time: 2022-11-16 Origin: Site
Synthetic rubber oil resistance, temperature resistance, corrosion resistance and other comprehensive performance better than natural rubber. General synthetic rubber operating temperature t ≤ 150 ℃, natural rubber t ≤ 60 ℃, rubber for nominal pressure PN ≤ 1MPa globe valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and other valve seals.
Nylon has a small coefficient of friction, good corrosion resistance, etc.. Nylon is used for ball valves, globe valves, etc. with temperature t ≤ 90℃ and nominal pressure PN ≤ 32MPa.
PTFE is used for globe valves, gate valves, ball valves, etc. with temperature t ≤ 232℃ and nominal pressure PN ≤ 6.4MPa.
Cast iron for the temperature t ≤ 100 ℃, nominal pressure PN ≤ 1.6MPa, gas and oil gate valves, globe valves, plug valves, etc.
Pasteurized alloy for temperature t -70 ~ 150 ℃, the nominal pressure PN ≤ 2.5MPa ammonia globe valve.
Copper alloy materials commonly used are 6-6-3 tin bronze and 58-2-2 manganese brass. Copper alloy wear resistance, suitable for temperature t ≤ 200 ℃, the nominal pressure PN ≤ 1.6MPa water and steam, commonly used in gate valves, globe valves, check valves, plug valves, etc..
Chrome stainless steel commonly used grades are 2Cr13, 3Cr13 by tempering, good corrosion resistance. Commonly used in the temperature t ≤ 450 ℃, nominal pressure PN ≤ 32MPa water, steam and oil and other media on the valve.
Chromium-nickel-titanium stainless steel commonly used grade 1Cr18Ni9ti, its corrosion resistance, erosion resistance and heat resistance performance is good. Suitable for temperature t ≤ 600 ℃, nominal pressure PN ≤ 6.4MPa of steam, nitric acid and other media, used in globe valves, ball valves, etc.
Nitriding steel commonly used grade is 38CrMoAlA, by carburizing treatment, has good corrosion resistance and anti-scuffing. Commonly used in the temperature t ≤ 540 ℃, the nominal pressure PN ≤ 10MPa power station gate valve.
Boriding boron from the body or valve body material directly processed sealing surface, and then boriding surface treatment, sealing surface wear resistance is very good. Used for power station drain valve.
